<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
	div {
		width: 200px;
		height: 200px;
		border: 1px solid red;
		/*padding-left: 20px;
		padding-top: 30px;*/
		/*padding: 20px;*/
		/*padding: 10px 30px;*/
		padding: 10px 30px 50px;
	}
	</style>
	
</head>
<body>
	<div>内边距就是内容和边框的距离</div>
</body>
</html>